docs: update release template and readme

.github/release-body.md

@@ -1,23 +1,20 @@
-## 📦 Release contents
-
-Windows installers and Windows portable archives for [Streamlink](https://github.com/streamlink/streamlink), which contain
-
-- an embedded Python environment
-- Streamlink and its dependencies
-- FFmpeg, required for muxing streams
-
-Please see the [README.md](https://github.com/streamlink/windows-builds#notes) about the differences between the installers and portable archives.
-
-For more information, please see Streamlink's [install docs](https://streamlink.github.io/install.html#windows-binaries).
-
 ## 📝 Changelog
 
 - [streamlink/streamlink](https://github.com/streamlink/streamlink/releases) (release changelog)
 - [streamlink/windows-builds](https://github.com/streamlink/windows-builds/blob/master/CHANGELOG.md) (packaging changelog)
 
-## ⚙️ How to use
+> [!IMPORTANT]  
+> Streamlink `7.0.0` changes:
+> - ⚠️ Support for Python 3.8 and Windows 7/8 systems has ended.
+> - ⚠️ No more `x86` ("32 bit") builds.  
+>   Please note that the `x86_64`-installer's default location differs from `x86`.  
+>   Users of non-`x86_64` systems can always build Streamlink+dependencies on their own.
+
+## ⚙️ Instructions
+
+See the [README.md](https://github.com/streamlink/windows-builds#notes) for all the details about the installers and portable archives.
 
-See the detailed [CLI guide](https://streamlink.github.io/cli.html) on Streamlink's website.
+Further information can be found in Streamlink's [install docs](https://streamlink.github.io/install.html) and [Command-Line Interface usage guide](https://streamlink.github.io/cli.html).
 
 ## ❤️ Support
 

README.md

@@ -7,6 +7,13 @@ Please see [Streamlink's install documentation](https://streamlink.github.io/ins
 
 The windows-builds changelog can be found [here](https://github.com/streamlink/windows-builds/blob/master/CHANGELOG.md).
 
+> [!IMPORTANT]  
+> Streamlink `7.0.0` changes:
+> - ⚠️ Support for Python 3.8 and Windows 7/8 systems has ended.
+> - ⚠️ No more `x86` ("32 bit") builds.  
+>   Please note that the `x86_64`-installer's default location differs from `x86`.  
+>   Users of non-`x86_64` systems can always build Streamlink+dependencies on their own.
+
 
 ## Contents